#include "oled.h"
#include "oledfont.h"
#include "stdlib.h"
#include "stm32f1xx_hal.h"

u8 OLED_GRAM[144][8];

//反显函数
void OLED_ColorTurn(u8 i)
{
    if(i==0)
    {
        OLED_WR_Byte(0xA6,OLED_CMD);//正常显示
    }
    if(i==1)
    {
        OLED_WR_Byte(0xA7,OLED_CMD);//反色显示
    }
}

//屏幕旋转180度
void OLED_DisplayTurn(u8 i)
{
    if(i==0)
    {
        OLED_WR_Byte(0xC8,OLED_CMD);//正常显示
        OLED_WR_Byte(0xA1,OLED_CMD);
    }
    if(i==1)
    {
        OLED_WR_Byte(0xC0,OLED_CMD);//反转显示
        OLED_WR_Byte(0xA0,OLED_CMD);
    }
}

//起始信号
void I2C_Start(void)
{
    OLED_SDIN_Set();
    OLED_SCLK_Set();
    OLED_SDIN_Clr();
    OLED_SCLK_Clr();
}

//结束信号
void I2C_Stop(void)
{
    OLED_SCLK_Set();
    OLED_SDIN_Clr();
    OLED_SDIN_Set();
}

//等待信号响应
void I2C_WaitAck(void) //测数据信号的电平
{
    OLED_SCLK_Set();
    OLED_SCLK_Clr();
}

//写入一个字节
void Send_Byte(u8 dat)
{
    u8 i;
    for(i=0;i<8;i++)
    {
        OLED_SCLK_Clr();//将时钟信号设置为低电平
        if(dat&0x80)//将dat的8位从最高位依次写入
        {
            OLED_SDIN_Set();
        }
        else
        {
            OLED_SDIN_Clr();
        }
        OLED_SCLK_Set();//将时钟信号设置为高电平
        OLED_SCLK_Clr();//将时钟信号设置为低电平
        dat<<=1;
    }
}

//发送一个字节
//向SSD1306写入一个字节。
//mode:数据/命令标志 0,表示命令;1,表示数据;
void OLED_WR_Byte(u8 dat,u8 mode)
{
    I2C_Start();
    Send_Byte(0x78);
    I2C_WaitAck();
    if(mode){Send_Byte(0x40);}
    else{Send_Byte(0x00);}
    I2C_WaitAck();
    Send_Byte(dat);
    I2C_WaitAck();
    I2C_Stop();
}


//开启OLED显示
void OLED_DisPlay_On(void)
{
    OLED_WR_Byte(0x8D,OLED_CMD);//电荷泵使能
    OLED_WR_Byte(0x14,OLED_CMD);//开启电荷泵
    OLED_WR_Byte(0xAF,OLED_CMD);//点亮屏幕
}

//关闭OLED显示
void OLED_DisPlay_Off(void)
{
    OLED_WR_Byte(0x8D,OLED_CMD);//电荷泵使能
    OLED_WR_Byte(0x10,OLED_CMD);//关闭电荷泵
    OLED_WR_Byte(0xAF,OLED_CMD);//关闭屏幕
}

//更新显存到OLED
void OLED_Refresh(void)
{
    u8 i,n;
    for(i=0;i<8;i++)
    {
        OLED_WR_Byte(0xb0+i,OLED_CMD); //设置行起始地址
        OLED_WR_Byte(0x00,OLED_CMD);   //设置低列起始地址
        OLED_WR_Byte(0x10,OLED_CMD);   //设置高列起始地址
        for(n=0;n<128;n++)
            OLED_WR_Byte(OLED_GRAM[n][i],OLED_DATA);
    }
}
//清屏函数
void OLED_Clear(void)
{
    u8 i,n;
    for(i=0;i<8;i++)
    {
        for(n=0;n<128;n++)
        {
            OLED_GRAM[n][i]=0;//清除所有数据
        }
    }
    OLED_Refresh();//更新显示
}

//画点
//x:0~127
//y:0~63
void OLED_DrawPoint(u8 x,u8 y)
{
    u8 i,m,n;
    i=y/8;
    m=y%8;
    n=1<<m;
    OLED_GRAM[x][i]|=n;
}

//清除一个点
//x:0~127
//y:0~63
void OLED_ClearPoint(u8 x,u8 y)
{
    u8 i,m,n;
    i=y/8;
    m=y%8;
    n=1<<m;
    OLED_GRAM[x][i]=~OLED_GRAM[x][i];
    OLED_GRAM[x][i]|=n;
    OLED_GRAM[x][i]=~OLED_GRAM[x][i];
}


//画线
//x:0~128
//y:0~64
void OLED_DrawLine(u8 x1,u8 y1,u8 x2,u8 y2)
{
    u8 i,k,k1,k2,y0;
    if((x1<0)||(x2>128)||(y1<0)||(y2>64)||(x1>x2)||(y1>y2))return;
    if(x1==x2)    //画竖线
    {
        for(i=0;i<(y2-y1);i++)
        {
            OLED_DrawPoint(x1,y1+i);
        }
    }
    else if(y1==y2)   //画横线
    {
        for(i=0;i<(x2-x1);i++)
        {
            OLED_DrawPoint(x1+i,y1);
        }
    }
    else      //画斜线
    {
        k1=y2-y1;
        k2=x2-x1;
        k=k1*10/k2;
        for(i=0;i<(x2-x1);i++)
        {
            OLED_DrawPoint(x1+i,y1+i*k/10);
        }
    }
}
//x,y:圆心坐标
//r:圆的半径
void OLED_DrawCircle(u8 x,u8 y,u8 r)
{
    int a, b,num;
    a = 0;
    b = r;
    while(2 * b * b >= r * r)
    {
        OLED_DrawPoint(x + a, y - b);
        OLED_DrawPoint(x - a, y - b);
        OLED_DrawPoint(x - a, y + b);
        OLED_DrawPoint(x + a, y + b);

        OLED_DrawPoint(x + b, y + a);
        OLED_DrawPoint(x + b, y - a);
        OLED_DrawPoint(x - b, y - a);
        OLED_DrawPoint(x - b, y + a);

        a++;
        num = (a * a + b * b) - r*r;//计算画的点离圆心的距离
        if(num > 0)
        {
            b--;
            a--;
        }
    }
}



//在指定位置显示一个字符,包括部分字符
//x:0~127
//y:0~63
//size:选择字体 12/16/24
void OLED_ShowChar(u8 x,u8 y,u8 chr,u8 size1)
{
    u8 i,m,temp,size2,chr1;
    u8 y0=y;
    size2=(size1/8+((size1%8)?1:0))*(size1/2);  //得到字体一个字符对应点阵集所占的字节数
    chr1=chr-' ';  //计算偏移后的值
    for(i=0;i<size2;i++)
    {
        if(size1==12)
        {temp=asc2_1206[chr1][i];} //调用1206字体
        else if(size1==16)
        {temp=asc2_1608[chr1][i];} //调用1608字体
        else if(size1==24)
        {temp=asc2_2412[chr1][i];} //调用2412字体
        else return;
        for(m=0;m<8;m++)           //写入数据
        {
            if(temp&0x80)OLED_DrawPoint(x,y);
            else OLED_ClearPoint(x,y);
            temp<<=1;
            y++;
            if((y-y0)==size1)
            {
                y=y0;
                x++;
                break;
            }
        }
    }
}


//显示字符串
//x,y:起点坐标
//size1:字体大小
//*chr:字符串起始地址
void OLED_ShowString(u8 x,u8 y,u8 *chr,u8 size1)
{
    while((*chr>=' ')&&(*chr<='~'))//判断是不是非法字符!
    {
        OLED_ShowChar(x,y,*chr,size1);
        x+=size1/2;
        if(x>128-size1)  //换行
        {
            x=0;
            y+=2;
        }
        chr++;
    }
}

//m^n
u32 OLED_Pow(u8 m,u8 n)
{
    u32 result=1;
    while(n--)
    {
        result*=m;
    }
    return result;
}

////显示2个数字
////x,y :起点坐标
////len :数字的位数
////size:字体大小
void OLED_ShowNum(u8 x,u8 y,u32 num,u8 len,u8 size1)
{
    u8 t,temp;
    for(t=0;t<len;t++)
    {
        temp=(num/OLED_Pow(10,len-t-1))%10;
        if(temp==0)
        {
            OLED_ShowChar(x+(size1/2)*t,y,'0',size1);
        }
        else
        {
            OLED_ShowChar(x+(size1/2)*t,y,temp+'0',size1);
        }
    }
}




//配置写入数据的起始位置
void OLED_WR_BP(u8 x,u8 y)
{
    OLED_WR_Byte(0xb0+y,OLED_CMD);//设置行起始地址
    OLED_WR_Byte(((x&0xf0)>>4)|0x10,OLED_CMD);
    OLED_WR_Byte((x&0x0f)|0x01,OLED_CMD);
}

//x0,y0：起点坐标
//x1,y1：终点坐标
//BMP[]：要写入的图片数组
void OLED_ShowPicture(u8 x0,u8 y0,u8 x1,u8 y1,u8 BMP[])
{
    u32 j=0;
    u8 x=0,y=0;
    if(y%8==0)y=0;
    else y+=1;
    for(y=y0;y<y1;y++)
    {
        OLED_WR_BP(x0,y);
        for(x=x0;x<x1;x++)
        {
            OLED_WR_Byte(BMP[j],OLED_DATA);
            j++;
        }
    }
}
//OLED的初始化
void OLED_Init(void)
{

    GPIO_InitTypeDef GPIO_InitStruct = {0};

    /* GPIO Ports Clock Enable */
    __HAL_RCC_GPIOA_CLK_ENABLE();

    /*Configure GPIO pin Output Level */


    /*Configure GPIO pin : PC13 */
    GPIO_InitStruct.Pin = GPIO_PIN_4|GPIO_PIN_5;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
    OLED_WR_Byte(0xAE,OLED_CMD);//--turn off oled panel
    OLED_WR_Byte(0x00,OLED_CMD);//---set low column address
    OLED_WR_Byte(0x10,OLED_CMD);//---set high column address
    OLED_WR_Byte(0x40,OLED_CMD);//--set start line address  Set Mapping RAM Display Start Line (0x00~0x3F)
    OLED_WR_Byte(0x81,OLED_CMD);//--set contrast control register
    OLED_WR_Byte(0xCF,OLED_CMD);// Set SEG Output Current Brightness
    OLED_WR_Byte(0xA1,OLED_CMD);//--Set SEG/Column Mapping     0xa0左右反置 0xa1正常
    OLED_WR_Byte(0xC8,OLED_CMD);//Set COM/Row Scan Direction   0xc0上下反置 0xc8正常
    OLED_WR_Byte(0xA6,OLED_CMD);//--set normal display
    OLED_WR_Byte(0xA8,OLED_CMD);//--set multiplex ratio(1 to 64)
    OLED_WR_Byte(0x3f,OLED_CMD);//--1/64 duty
    OLED_WR_Byte(0xD3,OLED_CMD);//-set display offset  Shift Mapping RAM Counter (0x00~0x3F)
    OLED_WR_Byte(0x00,OLED_CMD);//-not offset
    OLED_WR_Byte(0xd5,OLED_CMD);//--set display clock divide ratio/oscillator frequency
    OLED_WR_Byte(0x80,OLED_CMD);//--set divide ratio, Set Clock as 100 Frames/Sec
    OLED_WR_Byte(0xD9,OLED_CMD);//--set pre-charge period
    OLED_WR_Byte(0xF1,OLED_CMD);//Set Pre-Charge as 15 Clocks & Discharge as 1 Clock
    OLED_WR_Byte(0xDA,OLED_CMD);//--set com pins hardware configuration
    OLED_WR_Byte(0x12,OLED_CMD);
    OLED_WR_Byte(0xDB,OLED_CMD);//--set vcomh
    OLED_WR_Byte(0x40,OLED_CMD);//Set VCOM Deselect Level
    OLED_WR_Byte(0x20,OLED_CMD);//-Set Page Addressing Mode (0x00/0x01/0x02)
    OLED_WR_Byte(0x02,OLED_CMD);//
    OLED_WR_Byte(0x8D,OLED_CMD);//--set Charge Pump enable/disable
    OLED_WR_Byte(0x14,OLED_CMD);//--set(0x10) disable
    OLED_WR_Byte(0xA4,OLED_CMD);// Disable Entire Display On (0xa4/0xa5)
    OLED_WR_Byte(0xA6,OLED_CMD);// Disable Inverse Display On (0xa6/a7)
    OLED_WR_Byte(0xAF,OLED_CMD);
    OLED_Clear();
}
